From 36350e95a2b1feed6382fe38cc80f79ec35a1323 Mon Sep 17 00:00:00 2001 From: Gu Jinxiang Date: Thu, 12 Jul 2018 14:23:16 +0800 Subject: [PATCH] btrfs: return device pointer from btrfs_scan_one_device Return device pointer (with the IS_ERR semantics) from btrfs_scan_one_device so we don't have to return in through pointer. And since btrfs_fs_devices can be obtained from btrfs_device, return that. Signed-off-by: Gu Jinxiang Reviewed-by: Nikolay Borisov Reviewed-by: David Sterba [ fixed conflics after recent changes to btrfs_scan_one_device ] Signed-off-by: David Sterba --- fs/btrfs/super.c | 34 +++++++++++++++++++++------------- fs/btrfs/volumes.c | 18 +++++++----------- fs/btrfs/volumes.h | 4 ++-- 3 files changed, 30 insertions(+), 26 deletions(-) diff --git a/fs/btrfs/super.c b/fs/btrfs/super.c index 909ea25..5384afa 100644 --- a/fs/btrfs/super.c +++ b/fs/btrfs/super.c @@ -888,7 +888,7 @@ static int btrfs_parse_early_options(const char *options, fmode_t flags, { substring_t args[MAX_OPT_ARGS]; char *device_name, *opts, *orig, *p; - struct btrfs_fs_devices *fs_devices = NULL; + struct btrfs_device *device = NULL; int error = 0; lockdep_assert_held(&uuid_mutex); @@ -918,11 +918,13 @@ static int btrfs_parse_early_options(const char *options, fmode_t flags, error = -ENOMEM; goto out; } - error = btrfs_scan_one_device(device_name, - flags, holder, &fs_devices); + device = btrfs_scan_one_device(device_name, flags, + holder); kfree(device_name); - if (error) + if (IS_ERR(device)) { + error = PTR_ERR(device); goto out; + } } } @@ -1518,6 +1520,7 @@ static struct dentry *btrfs_mount_root(struct file_system_type *fs_type, { struct block_device *bdev = NULL; struct super_block *s; + struct btrfs_device *device = NULL; struct btrfs_fs_devices *fs_devices = NULL; struct btrfs_fs_info *fs_info = NULL; struct security_mnt_opts new_sec_opts; @@ -1561,12 +1564,14 @@ static struct dentry *btrfs_mount_root(struct file_system_type *fs_type, goto error_fs_info; } - error = btrfs_scan_one_device(device_name, mode, fs_type, &fs_devices); - if (error) { + device = btrfs_scan_one_device(device_name, mode, fs_type); + if (IS_ERR(device)) { mutex_unlock(&uuid_mutex); + error = PTR_ERR(device); goto error_fs_info; } + fs_devices = device->fs_devices; fs_info->fs_devices = fs_devices; error = btrfs_open_devices(fs_devices, mode, fs_type); @@ -2227,7 +2232,7 @@ static long btrfs_control_ioctl(struct file *file, unsigned int cmd, unsigned long arg) { struct btrfs_ioctl_vol_args *vol; - struct btrfs_fs_devices *fs_devices; + struct btrfs_device *device = NULL; int ret = -ENOTTY; if (!capable(CAP_SYS_ADMIN)) @@ -2240,19 +2245,22 @@ static long btrfs_control_ioctl(struct file *file, unsigned int cmd, switch (cmd) { case BTRFS_IOC_SCAN_DEV: mutex_lock(&uuid_mutex); - ret = btrfs_scan_one_device(vol->name, FMODE_READ, - &btrfs_root_fs_type, &fs_devices); + device = btrfs_scan_one_device(vol->name, FMODE_READ, + &btrfs_root_fs_type); + ret = PTR_ERR_OR_ZERO(device); mutex_unlock(&uuid_mutex); break; case BTRFS_IOC_DEVICES_READY: mutex_lock(&uuid_mutex); - ret = btrfs_scan_one_device(vol->name, FMODE_READ, - &btrfs_root_fs_type, &fs_devices); - if (ret) { + device = btrfs_scan_one_device(vol->name, FMODE_READ, + &btrfs_root_fs_type); + if (IS_ERR(device)) { mutex_unlock(&uuid_mutex); + ret = PTR_ERR(device); break; } - ret = !(fs_devices->num_devices == fs_devices->total_devices); + ret = !(device->fs_devices->num_devices == + device->fs_devices->total_devices); mutex_unlock(&uuid_mutex); break; case BTRFS_IOC_GET_SUPPORTED_FEATURES: diff --git a/fs/btrfs/volumes.c b/fs/btrfs/volumes.c index 459cc2a..fd9d4e0 100644 --- a/fs/btrfs/volumes.c +++ b/fs/btrfs/volumes.c @@ -1213,15 +1213,14 @@ static int btrfs_read_disk_super(struct block_device *bdev, u64 bytenr, * and we are not allowed to call set_blocksize during the scan. The superblock * is read via pagecache */ -int btrfs_scan_one_device(const char *path, fmode_t flags, void *holder, - struct btrfs_fs_devices **fs_devices_ret) +struct btrfs_device *btrfs_scan_one_device(const char *path, fmode_t flags, + void *holder) { struct btrfs_super_block *disk_super; bool new_device_added = false; - struct btrfs_device *device; + struct btrfs_device *device = NULL; struct block_device *bdev; struct page *page; - int ret = 0; u64 bytenr; lockdep_assert_held(&uuid_mutex); @@ -1237,18 +1236,15 @@ int btrfs_scan_one_device(const char *path, fmode_t flags, void *holder, bdev = blkdev_get_by_path(path, flags, holder); if (IS_ERR(bdev)) - return PTR_ERR(bdev); + return ERR_CAST(bdev); if (btrfs_read_disk_super(bdev, bytenr, &page, &disk_super)) { - ret = -EINVAL; + device = ERR_PTR(-EINVAL); goto error_bdev_put; } device = device_list_add(path, disk_super, &new_device_added); - if (IS_ERR(device)) { - ret = PTR_ERR(device); - } else { - *fs_devices_ret = device->fs_devices; + if (!IS_ERR(device)) { if (new_device_added) btrfs_free_stale_devices(path, device); } @@ -1258,7 +1254,7 @@ int btrfs_scan_one_device(const char *path, fmode_t flags, void *holder, error_bdev_put: blkdev_put(bdev, flags); - return ret; + return device; } static int contains_pending_extent(struct btrfs_transaction *transaction, diff --git a/fs/btrfs/volumes.h b/fs/btrfs/volumes.h index 9665b84..06d8bb7 100644 --- a/fs/btrfs/volumes.h +++ b/fs/btrfs/volumes.h @@ -403,8 +403,8 @@ blk_status_t btrfs_map_bio(struct btrfs_fs_info *fs_info, struct bio *bio, int mirror_num, int async_submit); int btrfs_open_devices(struct btrfs_fs_devices *fs_devices, fmode_t flags, void *holder); -int btrfs_scan_one_device(const char *path, fmode_t flags, void *holder, - struct btrfs_fs_devices **fs_devices_ret); +struct btrfs_device *btrfs_scan_one_device(const char *path, + fmode_t flags, void *holder); int btrfs_close_devices(struct btrfs_fs_devices *fs_devices); void btrfs_free_extra_devids(struct btrfs_fs_devices *fs_devices, int step); void btrfs_assign_next_active_device(struct btrfs_fs_info *fs_info, -- 2.7.4